Google Apps Directory Sync for Postini Services Administration Guide - Manual (Page 40)

Configuration 43
LDAP User Attributes
Specify what attributes Google Apps Directory Sync will use when generating the
LDAP user list.
LDAP User Attribute
Setting
Description
Server Type The type of LDAP server that you are using with the
directory sync utility.
If you are using a Lotus Domino, Microsoft Active
Directory, or Open LDAP directory server, select that
server type. Otherwise, select Other.
Example: Microsoft Active Directory
Email Address
Attribute The LDAP attribute that contains a user’s primary
email address.
Example: The default is mail .